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The 'Green house Effect ' may lead to global warming and increase in the temperature of the Earth . Green house effect is caused by green house gasses like Carbon dioxide , methane  , water vapour etc. When the solar radiations reach Earth some of them are absobed by earth and then  released to the atmosphere . Green house gasses present in atmosphere trap this heat and donot allow heat to go. This helps in keeping our planet warm , thus its essential for human survival . But the increase in the amount of green house gasses can lead to excess increase in the temperature of the Earth. 
Green house effect is a effect which emit dangerous gases such that they absorb the heat but do not radiate into atmosphere .